12542440 has 16 divisors (see below), whose sum is σ = 28220580. Its totient is φ = 5016960.

The previous prime is 12542437. The next prime is 12542449. The reversal of 12542440 is 4424521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11464996 + 1077444 = 3386^2 + 1038^2 .

It is not an unprimeable number, because it can be changed into a prime (12542449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156741 + ... + 156820.

Almost surely, 2^12542440 is an apocalyptic number.

12542440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12542440 is an abundant number, since it is smaller than the sum of its proper divisors (15678140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12542440 is a wasteful number, since it uses less digits than its factorization.

12542440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313572 (or 313568 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 12542440 is about 3541.5307424898. The cubic root of 12542440 is about 232.3417970281.

Adding to 12542440 its reverse (4424521), we get a palindrome (16966961).

The spelling of 12542440 in words is "twelve million, five hundred forty-two thousand, four hundred forty".